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<br />Ie <br /> <br />100.YEAR FLOOD PLAIN <br /> <br />-I <br /> <br />FLOODWAY <br />FRINGE <br /> <br /> <br />FLODOWA Y <br /> <br />FLDOaWAY <br />FRINGE <br /> <br />STREAM <br />CHANNEL <br /> <br />FLOOD ELEVATION WHEN <br />CONFINED WITHIN FLOODWAY <br /> <br /> <br />ENCROACHMENT <br /> <br /> <br />,.,1 <br />FLOOD ELEVATION <br />BEFORE ENCROACHMENT <br />ON FLOOD PLAIN <br /> <br />'.: !:!;!Iillilllillilllllliill <br /> <br />AREA OF FLOOD PLAIN THAT COULD <br />BE useD FDA DEVELOPMENT BY <br />RAISING GAOUN-O <br /> <br />LINE AS IS THE fLOOD ELEVATION BEFORE ENCROACHMENT. <br />LINE CD IS THE FLOOD ELEVATION AFTER ENCROACHMENT. <br />'SURCHARGE 15 NOTTO Exceeo 1,0 FOOT (FEMA REQUIREMENT) OR LESSER AMOUNT IF SPECIFIED BY STATE. <br /> <br />Figure 2. Floodway Schematic <br /> <br />5.0 INSURANCE APPLICATION <br /> <br />To establish actuarial insurance rates, data from the engineering study <br />must be transformed into flood insurance criteria. This process includes <br />the determination of reaches, Flood Hazard Factors, and flood insurance <br />zone designations for each flooding source studied in detail affecting <br />the City .of Sheridan. <br /> <br />5.1 Reach Determinations <br /> <br />Reaches are defined as sections of flood plain that have relatively <br />the same flood hazard, based on the average weighted difference <br />in water-surface elevations between the 10- and 100-year floods. <br />This difference may not have a variation greater than that indicated <br />in the following table for more than 20 percent of the reach: <br /> <br />Average Difference Between <br />10- and 100-Year Floods <br /> <br />Variation <br /> <br />Less than 2 feet <br />2 to 7 feet <br />7.1 to 12 feet <br />More than 12 feet <br /> <br />0.5 foot <br />1. 0 foot <br />2.0 feet <br />3.0 feet <br /> <br />11 <br />